Question 1
If a boat is capsized and the hull crosses the finishing line, is she considered as finishing the race?
Answer 1
Yes. See the definition
Finish.
Question 2
If the answer to question 1 is yes, must the crew be in physical contact with the boat?
Answer 2
The definition
Finish does not include any requirement about the crew being on board, however, rule
47.2 requires that any crew that has left the boat either by accident or to swim must be back on board before the boat continues in the race. A capsized boat that crosses the finishing line will finish as per the definition, but will break rule
47.2 if the crew are not in contact with the boat, except when they are in the water trying to right the boat. See answer 3.
Question 3
After part of the boat's hull crosses the finishing line, the crew get back on board. The boat returns to the course side and then crosses the finishing line again. Is this now a finish for the boat?
Answer 3
Yes. Her original crossing of the finishing line is no longer relevant, because she has continued to sail the course - see the definition
Finish, (c).